| 摘要 |
PURPOSE:To permit to change the speed of a hydraulic motor into only two speeds of high and low by a method wherein the opposite side surface of a swash plate is divided into a vertical surface part and a slanted surface part and the angle of slant of the swash plate is changed by a pushing member formed in a casing. CONSTITUTION:When a hydraulic pressure is not acting on an auxiliary plunger 15 in an auxiliary cylinder 14, the swash plate 4 is supported under contacting only the vertical surface part 40 with the inner wall of a cylinder 1 by the pushing device of a cylinder block 3. When oil is supplied into the auxiliary cylinder 14, the vertical surface part 40 of the swash plate 4 is separated from the inner wall of the cylinder 1 and the slanted surface part 41 of the swash plate 4 is supported under being contacted with the inner wall of the cylinder 1, therefore, the speed of the hydraulic motor may be changed into only two speeds of high and low. |
